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https://issues.apache.org/jira/browse/LUCENE-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-1591:
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Attachment: LUCENE-1591.patch
Patch includes:
* Wrapping the FileOutputStream with a BufferedOutputStream.
* Removing the calls to flush().
* Enhancement to EnwikiDocMaker's startElement and endElement - instead of
calling String.equals on the qualified name and compare on 5 different strings,
I added a static map from String to Integer and a static method getElementType
which returns an int. I then changed those methods to do a 'switch' on the
type. I haven't measured the perf. gain, but it's clear it should improve
things ...
There is an open question regarding the ant-1.7.1.jar dependency. Uwe mentioned
the commons Compress project, which handles the bzip format (as well as
others). I took a look and found no place to download a jar, as well as this
looks like a 'young' project, with very little documentation. This is not to
say the code is of low quality or not be trusted, it's just that I prefer the
ant dependency, at least until this project matures enough. And anyway I guess
everyone who uses Lucene has Ant in his system, so this doesn't look like a
major dependency.
However, if you think otherwise, then we should get a jar from there (checking
out the code and building it manually is the only way I see, but please correct
me if I'm wrong) and adapt the code to use it, do perf. measurements again etc.
> Enable bzip compression in benchmark
> ------------------------------------
>
> Key: LUCENE-1591
> URL: https://issues.apache.org/jira/browse/LUCENE-1591
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/benchmark
> Reporter: Shai Erera
> Fix For: 2.9
>
> Attachments: ant-1.7.1.jar, LUCENE-1591.patch, LUCENE-1591.patch
>
>
> bzip compression can aid the benchmark package by not requiring extracting
> bzip files (such as enwiki) in order to index them. The plan is to add a
> config parameter bzip.compression=true/false and in the relevant tasks either
> decompress the input file or compress the output file using the bzip streams.
> It will add a dependency on ant.jar which contains two classes similar to
> GZIPOutputStream and GZIPInputStream which compress/decompress files using
> the bzip algorithm.
> bzip is known to be superior in its compression performance to the gzip
> algorithm (~20% better compression), although it does the
> compression/decompression a bit slower.
> I wil post a patch which adds this parameter and implement it in
> LineDocMaker, EnwikiDocMaker and WriteLineDoc task. Maybe even add the
> capability to DocMaker or some of the super classes, so it can be inherited
> by all sub-classes.
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